US Bridges

IH 39 SB over Sth 16

Fair

Columbia County, Wisconsin · 1.0M S JCT Ush 51 · Structure no. B11011700000000

Built
1999
26 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
198 ft
4 main spans
Daily traffic
7,750
2022 count
Owner
State
State Highway Agency

About this bridge

IH 39 SB over Sth 16 is a concrete continuous slab carrying IH 39 SB over Sth 16 in Columbia County, Wisconsin. It was built in 1999, so it is 26 years old, younger than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,750 vehicles a day, roughly 10% of them trucks, projected to reach 9,300 by 2042. The structure is 198 ft (60.4 m) long and 49 ft wide.

CarriesIH 39 SB
CrossesSth 16
Location1.0M S JCT Ush 51
RouteInterstate 39
Coordinates43.55979, -89.49296
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length198 ft (60.4 m)
Longest span64 ft (19.4 m)
Deck width49 ft (15 m)
Roadway width46 ft (14.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,750 (2022)
Projected traffic9,300 by 2042
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 39 SB over Sth 16 built?

It was built in 1999, making it 26 years old in 2025.

What condition is IH 39 SB over Sth 16 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2023.

How much traffic does IH 39 SB over Sth 16 carry?

About 7,750 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is IH 39 SB over Sth 16?

The structure is 198 ft (60.4 m) long with a longest span of 64 ft (19.4 m) and a deck 49 ft wide.

Who owns IH 39 SB over Sth 16?

It is owned by the State Highway Agency.